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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f190deb980106468b9933e996d1ac904ed860ee5dac0dd93b287b8ad9d3c70f' 
  AND token = 'SopwHhYmdT7bEA7h0Tk+njcMHdkwwf12K5byzP7FutM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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