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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e93a2d0fd0379554285500ef666c29a393746d3fb179c678d351b5d845124b' 
  AND token = '+di5ueok6+0F05m3QYeB355sSoZJAi4gTrTsJ7rHUHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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