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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9b9b1d79120918d68485f5698b43a87cab14c5b72b71fa6d01982568b13a02' 
  AND token = 'MG6qCbqEcY6Trgw0S5v+AnToQ9MaYojNtad6VD+1qz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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