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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4445966eabea289e43a6bc807f684f6d4a1bc51f9e06b918cd5cf0b313ed07e' 
  AND token = 'Q7ncWOGghR+J3feB+eupTQ9xZlaDUO9s3npzdoSq3TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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