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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af81f97479799de420321cb9cbaaf90b72ac079305dffe88c418eb3c5ed5f2a' 
  AND token = '91uDGEN+9FrP1OYErslBDEIKB0gCpaO2GQd4xNw8p1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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