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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fd92e66df061805d1c16c3a175bbc42f9525ea98ac40af90d85900b29fe682' 
  AND token = 'Wj1wS+b8TTOezuWvzbD0b1GYGGI6/Dvum/2mphJo8rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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