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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d43b1ea505b355844345e4e9a5e0a4a7343c0a8d274c928b26df400c2b3d25' 
  AND token = 'yMTSJmLYwYjopT6frWpNNgw+Dej7JLwFTk6u0zSSSic=' 
  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"
    }
  }
}