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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92906cc705b0eac297d8190b406b68cf49db9ba4f153f54d436a0323030197c9' 
  AND token = 'S+4SoNFyuK7x+pH+h5GalAweaAM281ucyFuEByOx/uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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