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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c02b6ff104b6d53d70b0235c80746f1f2df92ec6edf235e9e285ee868d407d' 
  AND token = 'uoWtEmhQ4qoH3C8P7ydac/9n/tHf89zvVGg8/dr0B5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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