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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceda96ba0e7af955e880479ae308cd3a75d70c412644a01a33ae59f469bcc207' 
  AND token = '5fppHbXgKGXbWeCvxrtCIEsf9SGHvbxO0XOmabdOPPE=' 
  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"
    }
  }
}