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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a360a5eb2b1f0b13023b05f225db7767df251e795d0d8dc70c68d9e1ae7b11' 
  AND token = 'wpjaVci3oFMyKTcvrM/vVZbI/9S9o2F13mNlx14zmYA=' 
  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"
    }
  }
}