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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a64389a6668d5a7471a272d5c096315896454589d2f3ad2040890ae3c038332b' 
  AND token = '3FI4h/jJX7axKMPph2FpJJip0ezxaj4Xo+MwHUnur2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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