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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8bb6762634461ab4d40dda8327bf4b0ced8a1fd379e697e28cdd90c3410f7f' 
  AND token = '8DNv7Mt9ZhVkS7d3LP7yT1XAITMaGe4gz2KxdbYdCZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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