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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40e6255a87eb4ae11b4ac1091cecaae4591b29d33867e69eaa8944aabc4fd68' 
  AND token = 'oTQoyB2jDB9wrr43gsD8cXsgPd+9Z20LLjKLjvztLXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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