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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7a48cf4a11dedd79a953a21929aa52a0eb6cff0f1bc4ab1e89a2403665f9bc' 
  AND token = 'iPtxshJ6y5UBQebdk5u/XqNpx7Sc3muaZYGJGP6GQGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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