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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4877ea538919a55024e7d6dcd7b316ea3a2e4fed1886b98e9d01882f367250' 
  AND token = 'hx8/bo0ms16AhWNS7fGW5LtQLiAwGNZ+lceo0FTN6SA=' 
  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"
    }
  }
}