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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a825eaa29370b1b69c339aa89d9ca2ec4623af10aa0637876a016c0e06d5fb' 
  AND token = 'GV/a95lfnv15coSur7lTkgZpYM2ABoAyaFJzSWtNTvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}