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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd134e206c10bd714a234cc05915ca651d2900513006f9f968484a44db1cb8a6c' 
  AND token = 'Mt3+g4OUjTcL88ng6V6gcp56awgFTNYNgAoqMGkh6tA=' 
  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"
    }
  }
}