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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd1a7f11b2a1189e143f286df798028f397290fac3da2b2ef5647dc2bd5554b' 
  AND token = 'xa8PHhffXLZ6tbcv3MFbLSyGsZuDAtj+QOMHZ2j7+Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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