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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bced3910c8fbe7f79f3bbc03a0948dae8978e8621672520e67cd411d2fb86915' 
  AND token = 'bx2K0rGI1sm7AoDCBrP+GUEEZowqIS6wDxyUnXXoArA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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