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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdd9e9a47be49d05a19c4544a5b2bf6682687f772b5258a981c5aab6e688953' 
  AND token = '7QgcGxHcy9N/b+/3ITOXryd36AUVFaT++DgAp+PdV6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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