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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f28556374419b1e5a96f366c7e796c6826d8f1340ac5a40068318084090cedc' 
  AND token = 'jegVZx8daI2uRcBte+G21QWM6f742I9q071oPUDv0g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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