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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae28588e40c4d5bfbd8a5b6471b9fa09759919f819ae5c2a682199c03d4251b' 
  AND token = '7VfBNtPduARLl8jNReieosNYl7fBwa2qnSfsNGasZL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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