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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83be43cf4f47c16da012a14c70974c8cd1cf6427b7e15dfdff3671e5828d9b7e' 
  AND token = 'JNFBcdbZflDGZn0o2hPiAcFlKZY0/40L18puaCEjces=' 
  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"
    }
  }
}