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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43423d0e76a3488a4a058d3b2ec27fcbcc88a65be40a5d1611a873e18ec3507' 
  AND token = '8cXLuJrztCotjoBYFKqJWqyBJPzWRBCqKLt+iDvw1VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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