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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6de81053ad0e1d40e5e789cc912d84477c183f5238286c120d3bd095e2332fb' 
  AND token = 'Xhynu5j9q051ukZLzn+Q4gt1i5advDJIVYDI040KJPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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