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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf90a51c3db53bf6f08613f50446a69e0bc500bdb2be51190b235effd7841cd' 
  AND token = 'q2F3k2tZdGN7lMOD/76z4NVl6y/br3jgncqQMcgc6lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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