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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d0519d17adee59c564aedc5dc683b6f45f834b1d1cce2f43dac1ddda6ba0b7' 
  AND token = 'Q3yc77/KltgyLL8ZAJGagJ9C6zI9X1kmzAZtonxbNy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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