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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf5465c153f6d7b393800e936a1bc49f744743fa28cafb200fd7471509e73db' 
  AND token = '2k1Cphw57xW7opVGcuwgWcVPiy6ISubXD+2FP/xWm8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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