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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93099e36a073ac6f01611ef2a6ea43740b1bcb260cac9f71d131b4a452a4da5' 
  AND token = 'ccy+fywBnB0ft2CUsi/4W3rwMixM9TUIlF5YEnHk8Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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