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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2973cc26e300c31f9d68cc3458bc614e438c87bf28a683da7913c82d5217b8ec' 
  AND token = '1L35GKBatu70K+WPZwt6NI3Sha1p8FRTe1ubKN6XYTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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