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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75fab27aec627e5b41d52185ac3b96e0d74e5b9ff32fcf62f0566622863616a9' 
  AND token = 'CmFiVb9x2NaMS65K4ImCqk0qp0Y2Mj4DWbu92riTE48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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