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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a76f877f662b98f3144cfbbf9bd73550bcb3bbc39ea1fd55a1fdd68d9ab438' 
  AND token = 'JfD9CaQhbU++1rB1/WtBgoD/4sxynF7v35iojRy+iaU=' 
  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"
    }
  }
}