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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f1c35b860b75ef383cd11756146fb82eefaa8811c9cac1e806ef640d7d0979' 
  AND token = 'PZ1FgVEiX5eDv3a7mPqUx9xwE8UzeB4RFpAYtUc5pdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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