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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '388c0b46ff51dbb0a5de04e521aed28f6e9c270b8dd9b1d3a0e071777b306446' 
  AND token = 'Ze1SC8Clf8afTSrtDAfg942GAiLZpiOq33Q1e3D1BLU=' 
  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"
    }
  }
}