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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7284b4dfbcb2a1cf18f6c3c51d201158c76b6c56602794edc3d6f68a3cc0abd' 
  AND token = '8knnMCoisc65euI5sgX386sJnxZ2UOD3csBvuRLL2qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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