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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d62361b7d9ad207a9f08b303ca81d00a465a8fee98862191be160199a87a7e2' 
  AND token = 'SI5f/Gn1t4CzJdM/1ni+KgD6VxyGJa0fkOQFqGe0BMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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