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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc22a819509bb6569d3e152c6fd6b255d11f375c838620589a3c224d57abdcf' 
  AND token = '91f2d50Zu8VGG0hQ+ePMierhpZ05e75Q+5Xw6KCJuqw=' 
  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"
    }
  }
}