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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58783916da78a049805c21907c210b8a13f0152c799a41826e5934f81953c1e' 
  AND token = 'xm+FNz1ggWDX0un0XUf/vpGyyw9XWeIanfyaRNfdfIA=' 
  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"
    }
  }
}