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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd15ebf4c35c93c811921583c0e29694a5d44f173c6c3d44e46c00bd7c1c2252' 
  AND token = 'cKjICcpPjW1819UMR0piSmn3i/X52hCMt/GxL/padtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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