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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d4d8a6b3e60de4dd26c15e19d9ef6af7e5fd5d15076206b0d531d5320e72c9' 
  AND token = 'OW7IbiTVOKIwGPAwRahWckA6w28Rie+BJGJ6pFS7qNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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