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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd44c44ef4edc9d9b84c6457dc80ccf28025f5ac1b143d8eb5c936a0302db40b' 
  AND token = 'aSlPTwhepdQCs9SOK6JwSaQ5aI8WV4a7H7XhUKLliJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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