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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b172059e44ead27cc1b2904ff40f3ac0a8ec5ae92d1e8d37b0246c5528338f' 
  AND token = 'Oa6HpGE5tn1OGy+vDmk2clZOsdTuLjYeck6EtTNY55s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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